Printing press



April 22 1924.-

' J. B. BARNETT PRINTING PRESS Filed Aug. 15.

gwuantoz B Barnfi.

John

Patented Apr. 22, 1924.

UNITED STAT B ATENT OFFICE.

JOHN B. BARNETT, OF NORWOOD STATION, PENNSYLVANIA, ASSIG NOR TO PHILADEL- PHIA ELECTRO' PRINTING PRESS & MFG. VANIA, A GOEPORATION OF DELAWARE.

PRINTING PRESS.

Application fil'edAugust-IE, 1922. Serial no. 581,962.

To all whom it may concern:

Be it known that JOHN B. BARNETT, a citizen of the United States, residing at Norwood ,-Station, in the county of Dela-.

wareand State of Pennsylvania, has invented certain new and useful Improvementsin Printing Presses, of which the following is a specification.

This invention relates to printing presses and has special reference to an electrical operating printing press. 1

Qne important object of the inventionis to improve the general construction of devices of this character.

A second important object of the invention is to provide an improved electrical 'operated printing press of the fiat platen type, such as is used for small ers work, and the like.

A third important object of the invention is to provide an improved automatically operated electric printing press wherein the introduction ofa sheet of paper serves to close a circuit and thereby actuate the press.

A fourth important object of the invention is to provide an improved electrical operated printing press wherein a closed circuit which bringsthe platen into printing position is automatically opened immediately a printing. is completed.

With the above and other objects in view as will be hereinafter apparent, the inven tion consists in general of parts hereinafter fully described, illustrated in the accomjobs, engravpanying drawings and specifically claimedv partly in sec- V Figure 3 is an enlarged detail view of automatic circuit closing and opening device.

Figure 4 is a detail showing the modified arrangement of electrical operatin means.

In the embodiment of the invention herein disclosed the press is provided with a bed or base 10 for the reception of the form 11 carrying the type 12. Extending upward from the ends of the bed or base are standards 13 which are connected at their top by a transverse member 14. Through this transverse member extends a shaft or plunger 15 which forms the core of a solenoid 16 supported on the transverse member. On the lower end of this plunger, or core, is mounted the platen 17 which has at its ends guide yokes 18 embracing and guided'by the uprights or standards 13. This platen is normally held in its raised position by springs 19, the lower end of these springs being secured to the platen and the upper ends to the transverse member 14. At the rear of the base there is provided a notch 20 wherein is mounted an insulating block 21 carrying a contact 22 connected to a battery 23 or other source of electric energy by a wire 24. Also across this notch extends a pin 25 whereon is mounted an arm 26 carrying the contact 27 insulated from the arm and connected by a wire 28 with the solenoid 16. Also the battery 23 is connected by a wire 29 with said solenoid. Ordinarily the contacts 22 and 27 are held apart by a spring 30 which urgesthe lower end of the arm or lever 26'away from the contact 22. The upper end of this arm or lever projects above the type as can be readily seen in Figures 2 and 3 and in this position is engageable by the sheet of paper P as the latter is inserted. The spring 30 is very light so that CQ, 0]? NOR WOOD STATION, PENNSYL- the engagement by the paper forces the contact 27 with the contact 22 and thus'closes a circuit through the solenoid 16. The 010s ing of this circuit causesdepression of the platen 17 and on the edge of this platen there is provided a notch or slot 31 so that the upper end of the lever 26 passes up thereto. Also there is mounted on the platen a cam member 32 which, when the platen is in its lowermost position engages the up er end of the lever 26 anddraws it inwar so that the contact 27 is moved away from the contact 22. Thus, the circuit is broken through the solenoid and springs 19 return the platen to its former position.

In the form of the invention shown in Figure 4 the solenoid 16 is replaced by series of electromagnets 33 positioned below the base which thus becomes an electromagnet pole and serves to attract the platen 17 when energized, the latter being made of 1ron.

There has thus been rovided a simple and efliccient device of t e kind described and for the purpose specified.

K emes form herein shown and described, but it is desired to include all such as properly come Within the scope claimed.

' Having thus described the invention what isclaimed as new, is

1. In a printing press, a base, standards extending up from said base, a transverse member connecting the upper ends of said standards, a plunger s'lidable through said transverse member and constituting aisolenoid core, a platen carriedon the lower endof said plunger, a solenoid surrounding said core and means for closing a circuit through said solenoid.

2. In a printing press, a base, standards extending up from said base, a transverse member connecting the upper ends of said standards, a plunger slidable through said transverse memb'erand constituting a solenoid core, a platen carried on the lower end of said plunger, a solenold surrounding said core, a fixed contact on the base, a lever piv-i oted on said base and' carrying a movable contact movable into and out of engagement with the fixed contact, said lever having one I end extending upward for engagement by paper Inserted 1n sald press, circuit Wires'ineluding a source of electricity and connecting said contact with said solenoid, a spring normally holding said contacts open, and springs connecting said platen and transverse members to normally hold the platen away from the base.

3. In a printing press, a base, standards extending up from said base, a transverse member connecting the upper ends of said standards, a plunger slidable through said transverse member and constituting a solenoid core, a platen carried on the lower end of said plunger, a solenoid surrounding said core, a fixed contact on the base, a lever pivoted on said base and carrying a movable contact movable into and out of engage-' ment with the'fixed contact, said lever having one end extending upward for engagement by paper inserted in said press, circuit wires including a source of electricity and connecting said contact with said solenoid,

a spring normally holding said contacts open, springs connecting said platen and transverse members to normally hold the platen away from the base, and a cammember carried by the platen and engageable with the lever to open the connection'be tween the contact upon the platen reaching printing position. y

In testimony whereof I aflix my signa-.

ture.

JOHN B. BARNETT. 

